Rail sit-prevention unit



FIG. 1 is a perspective view of a rail sit-prevention unit.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a side view thereof; and,

FIG. 5 is a top view thereof.

The broken lines showing environmental structural is for illustrative purposes only and form no part of the claim. 

CLAIM We claim the ornamental design for a rail sit-prevention unit, as shown and described. 